Parsing result of URL.getHost()

Need help parsing...

In my code, I have a method that returns url.getHost();. But the results of that can be blarg.com, or sometimes dates.blarg.com. I want to return blarg.com for either situation (or for xxx.yyy.ggg.blarg.com).

I can I accompl开发者_开发百科ish this?

Thanks!

EDIT: getHost() is from java's built in class java.net.URL.

String host = url.getHost();
Matcher m = Pattern.compile("^.+[.]([^.]+[.][^.]+)$").matcher(host);
if(m.matches()) {
  host = m.group(1);
}

Using split:

String host = url.getHost();
String[] items = host.split("\\.");
if(items.length>2)
   host = items[items.length-2] + '.' + items[items.length-1];

Using indexes:

String host = url.getHost();
while(host.indexOf('.')!=host.lastIndexOf('.')) {
  host = host.substring(host.indexOf('.') + 1);
}